Pipe-threading tool



Dec. 28 1926. i I 1,611,991

B. BORDEN PIPE THREADING TOOL Filed Sept. 2 1925 2 Snee*;-Sheei l Dec. 28 1926.

B. BORDEN PIPE THREADING TOOL Filed Sept. 2 1925 2 Sneets-Sheet 2 Patented Dec. 28, 1926.

PAT?! l ifild.

BRADFORD BORDER] OF ELEVELAND, 0310.

PIPE-TIEBEADING TOOL. I

Application filed September and has for its principal object to provide,

a very simple, durable, and inexpensive construction whereby one set of dies may be adjusted for threading variously sized work without necessitating removal of the dies from the stock.

The invention further contemplates among other things a construction whereby the dies may be quickly and accurately set for different sized work even in a poorly lighted shop, and which, once having been set, will be effectively held in set position against accidental movement during the manipulation of the tool either in the threading operation or in the changing from one piece of work to another.

Another object of the invention is to provide in connection with the die carrying slide disclosed in my co-pending application above referred to an improved form of adjustable stop or backing member for the die, one with which will be of such a character as to obviate the necessity of a set screw stop for the dies threaded through the slides or carriers and an independent means for determining the proper setting thereof such as is employed in the application referred to.

By way of introduction, I will state that the dies are slidably supported in the bosses of the die stock as usual and as in my c0- pending application Serial No. 17,737 the dies rest upon a slide member, both the dies and the slide member being of a width equal to the width of the slot in the die stock boss. The slide members have side lugs adapted to be engaged in diagonal grooves in the flat surfaces of posts upon which the die stock is slidable. Consequently the movement of the die stock in the threading operation and toward the work holder will result in a receding action of the slides with the dies so that a tapered thread will be cut. Each of the bosses of the die stock has overhanging top edges which engage the tops of the dies to hold them down upon the slide members. A spring pressed stud carried by each slide member is engage-able in any one of a plurality of notches in the bottom of the die so as to prevent accidental dropping of the dies from the tool as for instance when the tool is not in use. The means for adjusting 2, 1925. Serial l lo. 54,128.

the dies relatively of their supporting slides comprises a rotatable block mounted upon the outer ends of the slides. This block has a plurality of ecges which are variously spaced from the pivot pin on which the block rotates and which act as a backing for the dies in cutting threads on variously sized work. The difference in distance between the pivotpin of the block and the respective die backing edges corresponds to the spaces between the notches on the bottom of the die which are engaged by the spring pressed stud carried by the slides or carriers.

The various features of novelty of the invention are pointed out with particularity in the claims annexed to and forming a part of this specification. I am aware that various changes may be made in the structure illustrated without a departure from the subject matter as claimed and, therefore,

do not propose to restrict myself to the preferred embodiment of the invention which this application discloses. i

In the drawings,

Figure 1 is a plan view of a die stock incorporating my invention Fig. 2 is a side elevation with one of the die stock handles broken away to better illustrate the die slide and post construction;

Fig. 3 is a section taken on the line 33 of Fig. 1;

Fig. 4: is a detail sectional view taken on the line li of Fig. 8, and

Fig. 5 is a group perspective view of the die and slide members.

Referring specifically to the crawings, the numeral 1 denotes a work holder which may be of any preferred type, the same being provided with a shouldered neck portion 2 which surrounds the work receiving opening and supports an annulus or plate 3 from which rise posts l. These posts are slidably received in holes extending transversely through the longitudinally slotted bosses 6 of the die stock 5. A ring 7 threaded upon the neck 2 of the work holder serves to retain the annulus 3 against displacement but permits rotation thereof. The inner portion of the neck 2 is threaded for the reception of the leader screw 8 carried by the die stock 5 whereby the latter will be progressively moved in the direction of the work holder as the threading operation progresses. This is a well known and familiar construc tion in the art.

The slots or slideways 9hr the bosses 6 are radially arranged and communicate entirely through the said bosses from the work receiving opening of the die stock. At the outer end of each boss the stock is formed with an extension 5 which is cut with a surface groove 6. This groove 6 forms a continuation of the slideway 9 in the proximate boss 6. The purpose of this construction will become more apparent as the description proceeds.

It is to be noted that the transverse post holes in the bosses 6 are so drilled as to intersect the slideways 9 adjacent one side; also that the posts it are provided with flat longitudinal faces a, the edges of which are designed to lie flush-with the side wall of each slideway. As clearly shown inthe drawings, particularly Fig. 3, the slideways 9 receive die carriers 10 of a width equal to the width of the slideways and each of the carriers 10 has a post or pin 13 rising from its upper surface upon which is rotatably mounted a polygonally shaped block 12, the various edge portions of which are located at different distances from the said pin 13. The edge portions of the block 12 may be recessed as indicated at 12 and act as a support or backing for the dies, the proper edge of the block being presented to the die according to the size of work to be threaded. It will be evident that the block 12 constitutes a variable stop engaging the ends of the dies 11. Fig. 3 also illustrates that the dies 11 which maybe of the usual form are designed to be slidably and'removably supported upon the carriers 10. Each carrier has a spring pressed stud 10 which is adapted to be engaged in any one of a plurality of notches 11 in the bottom edge of the die. These notches 11 are so spaced that the spring pressed stud 10 will be engaged in one of them when one of the faces or edges 12 of the block 12 is engaged with the back end of the die. The object of this pin and notch construction is to prevent the dies from accidentally sliding out of the stock as for instance when the tool is not in use. The overhanging top edges of the bo'ss'6, de' noted at 6, slidingly engage the top edges of the dies thus preventing any rocking thereof or any other kindred objectionable move ment which would reduce the eificie'ncy of the tool.

As mentioned in the introductory part of the specification, each of the posts 4 has its flattace r provided with a diagonal groove 42* which is designed to receive a projecting lug 14 carried by the die slide 10. The groove 4 is open at its upper end whereby the lug 1a may be engaged therein. The lower end of the groove 4 is so directed as to accelerate the receding movement of the slide 10 when the lug 1e reaches this point. Thus the dies 11 will be completely disengaged from the work at the completion of the threading operation. The laterally curved lower end portion of the groove 4 is indicated at 4?.

When it is desired to remove the carriers 10 from the slideways 9 it is only necessar to elevate the die stock on the posts a sui'licient distance so that the lugs 1a of the carriers will be clear of the post grooves P. The slides 10 can then, otcourse, he slipped out of the sl'i-dev ays 9. The posts a are of suili'cient length, as are also the grooves t, to permit the die stock to be set at the start of the threading operation for cutting either a shallow or a deep thread, or for adapting the die teeth to engage either under or oversized work. The die stock is rotated in the usual manner by handles which are indicated by the numeral 16 and are carried in sockets 1"? projecting from the sides of the die stock.

Having thus described the invention, what is claimed is z 1. The combination with a die stock having a work receiving opening, carriers associated with the stock and having posts, dies mounted on the carriers, and blocks rotatably mounted on said posts, each block being provided with a plurality of die contact surfaces adapted to be selectively engaged with the associated die whereby the cutting diameter of the dies may be regulated.

2. The combination with a die stock having a work receiving opening, carriers associated with the stock and having posts, dies mounted on the carriers, blocks rotatably mounted on said posts, each block being provided with a plurality of die contact surfaces adapted to be selectively engag'ed with the associated die whereby the cutting diameter of the dies may be regulated, and holding devices for holding the dies in adjusted positions with respect to said carriers. I

3. The combination with a die stock; of carriers adjustable with respect to said stock, dies mounted on said carriers, back-up blocks adjustably associated with said carriers, each block being provided with a number of active faces adapted to be selectively engaged with said dies whereby the positions of the dies with respect to the carriers and with respect to the axis of the stock may be varied, and means associated with the carriers for withdrawing the dies from engagement with the work as the completion oi the threading operation is approached.

l. The combination with a die stock; of carriers adjustable with respect to said stock, dies mounted on said carriers, back-up blocks adjustably associated with said carriers, each block being provided with a numbeu of active faces adapted to'be selectively engage-d with said dies whereby the positions of the dies with respect to the carriers and with respect to the axis of the stool: may be varied, and means associated with the carriers for Withdrawing the dies from engagement with the Work as the completion of the threading operation is approached, there being means to yieldingly hold the dies in place at all operative adjustments of the dies.

5. The combination With a die stock having a plurality of channeled guide members, oi dies received in said channeled guide members, posts arranged rearwardly of said guide members, back-up blocks rotatably mounted on said posts and having faces po sitioned different distances from said posts, said faces being adapted to be selectively positioned at the rear ends of said dies whereby the cutting diameter of the dies may be varied, and means to hold said dies in adjusted positions.

In testimony whereof I affix my signature.

BRADFORD BORDEN. 

